Source Code Cross Referenced for SAXEntityResolver.java in  » Parser » NanoXML » net » n3 » nanoxml » sax » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Parser » NanoXML » net.n3.nanoxml.sax 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* SAXEntityResolver.java                                           NanoXML/SAX
002:         *
003:         * $Revision: 1.4 $
004:         * $Date: 2002/01/04 21:03:28 $
005:         * $Name: RELEASE_2_2_1 $
006:         *
007:         * This file is part of the SAX adapter for NanoXML 2 for Java.
008:         * Copyright (C) 2000-2002 Marc De Scheemaecker, All Rights Reserved.
009:         *
010:         * This software is provided 'as-is', without any express or implied warranty.
011:         * In no event will the authors be held liable for any damages arising from the
012:         * use of this software.
013:         *
014:         * Permission is granted to anyone to use this software for any purpose,
015:         * including commercial applications, and to alter it and redistribute it
016:         * freely, subject to the following restrictions:
017:         *
018:         *  1. The origin of this software must not be misrepresented; you must not
019:         *     claim that you wrote the original software. If you use this software in
020:         *     a product, an acknowledgment in the product documentation would be
021:         *     appreciated but is not required.
022:         *
023:         *  2. Altered source versions must be plainly marked as such, and must not be
024:         *     misrepresented as being the original software.
025:         *
026:         *  3. This notice may not be removed or altered from any source distribution.
027:         */
028:
029:        package net.n3.nanoxml.sax;
030:
031:        import java.io.InputStream;
032:        import java.io.InputStreamReader;
033:        import java.io.Reader;
034:        import java.net.URL;
035:        import net.n3.nanoxml.XMLEntityResolver;
036:        import net.n3.nanoxml.IXMLReader;
037:        import org.xml.sax.EntityResolver;
038:        import org.xml.sax.InputSource;
039:
040:        /**
041:         * SAXEntityResolver is a subclass of XMLEntityResolver that supports the
042:         * SAX EntityResolver listener.
043:         *
044:         * @see net.n3.nanoxml.IXMLEntityResolver
045:         *
046:         * @author Marc De Scheemaecker
047:         * @version $Name: RELEASE_2_2_1 $, $Revision: 1.4 $
048:         */
049:        public class SAXEntityResolver extends XMLEntityResolver {
050:
051:            /**
052:             * The SAX EntityResolver listener.
053:             */
054:            private EntityResolver saxEntityResolver;
055:
056:            /**
057:             * Creates the resolver.
058:             */
059:            public SAXEntityResolver() {
060:                this .saxEntityResolver = null;
061:            }
062:
063:            /**
064:             * Cleans up the object when it's destroyed.
065:             */
066:            protected void finalize() throws Throwable {
067:                this .saxEntityResolver = null;
068:                super .finalize();
069:            }
070:
071:            /**
072:             * Sets the SAX EntityResolver listener.
073:             *
074:             * @param resolver the entity resolver
075:             */
076:            public void setEntityResolver(EntityResolver resolver) {
077:                this .saxEntityResolver = resolver;
078:            }
079:
080:            /**
081:             * Opens an external entity.
082:             *
083:             * @param xmlReader the current XML reader
084:             * @param publicID the public ID, which may be null
085:             * @param systemID the system ID
086:             *
087:             * @return the reader, or null if the reader could not be created/opened
088:             */
089:            protected Reader openExternalEntity(IXMLReader xmlReader,
090:                    String publicID, String systemID) {
091:                try {
092:                    URL url = new URL(xmlReader.getSystemID());
093:                    url = new URL(url, systemID);
094:
095:                    if (this .saxEntityResolver != null) {
096:                        InputSource source = this .saxEntityResolver
097:                                .resolveEntity(publicID, url.toString());
098:
099:                        if (source != null) {
100:                            Reader reader = source.getCharacterStream();
101:
102:                            if (reader != null) {
103:                                return reader;
104:                            }
105:
106:                            InputStream stream = source.getByteStream();
107:
108:                            if (stream == null) {
109:                                publicID = source.getPublicId();
110:                                systemID = source.getSystemId();
111:                            } else {
112:                                String encoding = source.getEncoding();
113:
114:                                if (encoding != null) {
115:                                    return new InputStreamReader(stream,
116:                                            encoding);
117:                                } else { // if encoding == null
118:                                    return new InputStreamReader(stream);
119:                                }
120:                            }
121:                        }
122:                    }
123:
124:                    return super .openExternalEntity(xmlReader, publicID,
125:                            systemID);
126:                } catch (Exception e) {
127:                    return null;
128:                }
129:            }
130:
131:        }
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